When a force of 40 N is applied on a body it moves with an acceleration of 5 m s^-2. Calculate the mass of the body.

Show that the rate of change of momentum is equal to product of mass and acceleration.

State the law of conservation of momentum. Derive it by using Newton’s third law of motion.

It is required to increase the velocity of a scooter of mass 80 kg from 5 to 25 m s^-1 in 2 second. Calculate the force required.

Two blocks made of different metals identical in shape and size are acted upon by equal forces which cause them to slide on a horizontal surface. The acceleration of the second block is found to be 5 times that of the first. What is the ratio of the mass of the second to first?